Download E-books The Tangled Web: A Guide to Securing Modern Web Applications PDF

By Michal Zalewski

"Thorough and accomplished insurance from one of many most appropriate specialists in browser security."
--Tavis Ormandy, Google Inc.

Modern internet functions are equipped on a tangle of applied sciences which have been constructed over the years after which haphazardly pieced jointly. each piece of the net program stack, from HTTP requests to browser-side scripts, comes with very important but refined safeguard results. to maintain clients secure, it's crucial for builders to hopefully navigate this landscape.

In The Tangled Web, Michal Zalewski, one of many world's most sensible browser safeguard specialists, bargains a compelling narrative that explains precisely how browsers paintings and why they're essentially insecure. instead of dispense simplistic recommendation on vulnerabilities, Zalewski examines the whole browser defense version, revealing susceptible issues and delivering the most important info for shoring up internet software protection. you are going to find out how to:

  • Perform universal yet strangely advanced projects akin to URL parsing and HTML sanitization
  • Use glossy safety features like Strict delivery safety, content material protection coverage, and Cross-Origin source Sharing
  • Leverage many editions of the same-origin coverage to securely compartmentalize advanced net purposes and safeguard consumer credentials in case of XSS bugs
  • Build mashups and embed devices with out getting stung by way of the difficult body navigation policy
  • Embed or host user-supplied content material with no working into the capture of content material sniffing

For fast reference, "Security Engineering Cheat Sheets" on the finish of every bankruptcy supply prepared suggestions to difficulties you are probably to come across. With insurance extending so far as deliberate HTML5 beneficial properties, The Tangled net might help you create safe net functions that stand the try out of time.

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In daring and won't placed the rest of the record in italics: some_element. innerHTML = "Hi"; some_element. innerHTML += " mother! "; in its place, every one of those assignments could be processed and corrected separately, leading to a habit such as this: some_element. innerHTML = "Hi mother! "; you will need to word that the innerHTML mechanism may be used with severe warning. as well as being inherently at risk of markup injection if right HTML escaping isn't really saw, browser implementations of the DOM-to-HTML serialization algorithms are frequently imperfect. a up to date (now mounted) instance of this type of challenge in WebKit7 is illustrated right here: a hundred and ten bankruptcy 6 Because of the confusion over the semantics of In this sort of scenario, even acting a no-op project of this serialization (such as some_element. innerHTML += "") may result in unforeseen script injection. comparable difficulties are inclined to plague different browsers, too. for instance, net Explorer builders engaged on the innerHTML code have been unaware that MSHTML acknowledges backticks (`) as quote characters and so ended up dealing with them incorrectly. of their implementation, the subsequent markup: ``onload=alert(1) will be reserialized as this: ``onload=alert(1) person insects apart, the location with innerHTML is lovely dire: part 10. three of the present draft of HTML5 easily recognizes that yes script-created DOM buildings are thoroughly most unlikely to serialize to HTML and doesn't require browsers to act sensibly in one of these case. Caveat emptor! entry to different records Scripts may possibly come into ownership of item handles that time to the basis hierarchy of one other scripting context. for instance, through default, each context can without problems reference guardian, most sensible, opener, and frames[], all provided to it within the top-level item. Calling the window. open(... ) functionality to create a brand new window also will go back a reference, and so will an try to search for an present named window utilizing this syntax: var window_handle = window. open("", "window_name"); as soon as this system holds a deal with pointing to a different scripting context, it might try and engage with that context, topic to defense assessments mentioned in bankruptcy nine. An instance of an easy interplay could be as follows: most sensible. position. direction = "/new_path. html"; or frames[2]. record. getElementById("output"). innerHTML = "Hi mother! "; B row s e r- Si de S cri pts 111 In the absence of a sound deal with, JavaScript-level interplay with an unrelated rfile shouldn't be attainable. specifically, there is not any strategy to search for unnamed home windows opened in thoroughly separate navigation flows, not less than until eventually their identify is explicitly set by way of one of many visited pages (the window.

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